Rate-maximizing power allocation in OFDM based on partial channel knowledge

被引:96
作者
Yao, YW [1 ]
Giannakis, GB
机构
[1] Univ Illinois, Dept Elect & Comp Engn, Chicago, IL 60607 USA
[2] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA
关键词
adaptive modulation; average rate; orthogonal frequency division multiplexing (OFDM); outage rate; partial channel state information (CSI);
D O I
10.1109/TWC.2005.847022
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Power loading algorithms improve the data rates of orthogonal frequency division multiplexing (OFDM) systems. However, they require the transmitter to have perfect channel state information, which is impossible in most wireless systems. We investigate the effects of imperfect (and thus partial) channel feedback on the throughput of OFDM systems. Two channel uncertainty models are studied: 1) the ergodic model, where average rate is the figure of merit and 2) the quasi-static model, where outage rate is relevant. Rate-power allocation algorithms are developed. The throughput achieved by these algorithms and the effects of channel multipath are investigated analytically and with simulations.
引用
收藏
页码:1073 / 1083
页数:11
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